Right you are.   Found a Victron video that describes some of the risks of 
mixing higher efficiency batteries with older alternators and what can go 
wrong.    

https://www.youtube.com/watch?v=jgoIocPgOug

So much to learn so little time.



>     On 09/04/2020 10:43 AM Joel Aronson via CnC-List <cnc-list@cnc-list.com> 
> wrote:
> 
> 
>     Lithium have a different charge profile, so chargers and regulators need 
> to be adjusted or you will fry the lithiums.
> 
>     Joel
> 
>     On Fri, Sep 4, 2020 at 10:41 AM CHARLES SCHEAFFER via CnC-List < 
> cnc-list@cnc-list.com mailto:cnc-list@cnc-list.com > wrote:
> 
>         > >         I've been following a few RV channels on YouTube and 
> learning about lithium batteries?   Some people are living "off-the-grid, 
> living large with solar panels and inverters.  Just learned that lithium 
> batteries are 40 pounds less weight per battery and last three to five times 
> as many years, (3000 to 5000 cycles vs 1000 cycles for AGMs).  AGMs and Lead 
> Acid shouldn't be drained below 50% so you really need four 100ah AGM 
> batteries to have 200ah available.  Lithium can be drained down to nothing 
> without harm, so two give you 200ah.  If I was keeping my boat, or doing any 
> long cruises, I'd definitely look into those.  I got eleven years from my 
> first AGM batteries so Lithium should last me thirty years.  One Lithium 
> battery presently costs $950 for Battleborn vs $300 for a quality AGM and two 
> lithium batteries ($1900 and 58# total weight) equal the amp hours of four 
> AGMs ($1200 and 276# total weight).  Lithium is actually $500 cheaper if you 
> keep the boat long enough to have to replace the AGMs twice (cost $2400) and 
> they are 218# lighter.  That's a hell of a weight savings for racers.
> > 
> >         Prices keep falling for this new technology, so it's simply a 
> > matter of time.  I think one Lithium might replace my two AGMs at some 
> > point in the near future.
> > 
> >         Chuck Scheaffer, Resolute 1989 C&C 34R
> >         _______________________________________________
> > 
> >         Thanks everyone for supporting this list with your contributions.  
> > Each and every one is greatly appreciated.  If you want to support the list 
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> > 
> > 
> >     > 
> 
>     --
>     Joel
> 
>     _______________________________________________
> 
>     Thanks everyone for supporting this list with your contributions. Each 
> and every one is greatly appreciated. If you want to support the list - use 
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> 
> 
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